5 Environmental Sustainability

While transportation enhances the quality of our lives, it also generates environmental impacts. Since 1980, most transportation-related air pollutant emissions have declined. This follows national mandates for more stringent vehicle emission standards, cleaner burning fuels, and greener...

4-17 Government Transportation Expenditures by Mode and Level of Government: 2000, 2007, 2008, 2009 (millions of current dollars)

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4-16 Government Transportation Revenues by Mode and Level of Government: 2000, 2007, 2008, 2009 (millions of current dollars)

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4-15 Major Sources of Petroleum Consumed in the U.S.: 1990, 2000, 2010, 2011 (thousand barrels per day, average)

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4-14 U.S. Petroleum Imports: 1985–2011

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Notes: OPEC (Organization of Petroleum Exporting Countries) members are Algeria, Angola, Ecuador, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Ara- bia, the United Arab Emirates, and Venezuela. Angola joined OPEC in January 2007. Ecuador was a member of OPEC from...

4-13 New U.S. Passenger Car and Light Truck Production: Model Years 1985–2011

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Notes: Historical data are revised. Light trucks include SUVs, minivans/vans, and pick-up trucks.

Source: U.S. Environmental Protection Agency, Light-Duty Automotive Technology, Carbon Dioxide Emissions, and Fuel Economy Trends: 1975 Through 2011, appendix E,...

4-12 Top 20 World Container Ports: 2009 and 2010 (thousands of full and empty TEUs)

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4-11 Top 20 U.S. Water Ports by Shipment Weight & Top 20 U.S. Water Ports by Container TEUs: 2010

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4-10 Top 20 U.S.-International Trade Freight Gateways by Value of Shipments: 2011 (billions of current dollars)

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4-9 U.S. Merchandise Trade With Canada and Mexico by Mode Share: 2011

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aThe Bureau of Transportation Statistics estimated  weight of exports for truck, rail, pipeline, mail and other and unknown modes based on the import weight- to-value ratios that vary by country, mode, and commodity. bWeight data for water transportation vary from...